Making sure we can build libRS on the host for serialization.

Change-Id: If0a5d77b20c0e1e2d124fa0737643a5dd1d4409a
diff --git a/libs/rs/RenderScript.h b/libs/rs/RenderScript.h
index f160ef1..882a0b0 100644
--- a/libs/rs/RenderScript.h
+++ b/libs/rs/RenderScript.h
@@ -365,6 +365,9 @@
 RsAllocation rsaAllocationCubeCreateFromBitmap(RsContext con, RsType vtype,
                                                RsAllocationMipmapControl mips,
                                                const void *data, uint32_t usages);
+#ifdef ANDROID_RS_BUILD_FOR_HOST
+#define NO_RS_FUNCS
+#endif
 
 #ifndef NO_RS_FUNCS
 #include "rsgApiFuncDecl.h"